‘Swinging ORP’ as operation strategy for stable reject water treatment by nitritation–anammox in sequencing batch reactors

Lackner, Susanne; Lindenblatt, C.; Horn, Harald

doi:10.1016/j.cej.2011.11.043

Cited by 47 publications

(22 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The ORP has been widely used as a control parameter for online monitoring and control of nitrification and denitrification since 1980s (28). The operating ORP for nitrification and denitrification have been reported between -100 and +100 mV (28). Also, Ra et al believed that the complete depletion of nitrate is occurred around -300 to -400 mV (29).…”

Section: Effect Of Oxidation Reduction Potentialmentioning

confidence: 99%

“…Based on the relationship between the ORP and the concentrations of reduced and oxidized species involved in denitrification processes can be ensured that the denitrification is performed. The ORP has been widely used as a control parameter for online monitoring and control of nitrification and denitrification since 1980s (28). The operating ORP for nitrification and denitrification have been reported between -100 and +100 mV (28).…”

Section: Effect Of Oxidation Reduction Potentialmentioning

confidence: 99%

See 1 more Smart Citation

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Hossini

Rezaee

2014

Health Scope

View full text Add to dashboard Cite

Background:The presence of nitrate and its intermediates are considered undesirable compounds in the environment. Various methods have been proposed to remove nitrate from wastewater and water streams. Objectives: In this study, we investigated removal of nitrate from an aqueous solution by the process of electrocoagulation, using aluminum/graphite as the anode/cathode electrodes. Materials and Methods:We applied response surface methodology (RSM) as the statistical method for modeling, and optimizing the applied variables. All experiments were performed according to the standard methods for the examination of water and wastewater. To prepare the optimum condition, we considered the following amount of compounds and conditions: NaCl, 1 g/L; nitrate concentration range, 50-200 mg/L; applied electric current range, 0.05-0.2 A; anode, aluminum; cathode, graphite; and detention time: 120 minutes. Results:The results showed that by applying electric current of 0.14 A for 120 minutes, the nitrate content would reduce down to 97%. The obtained R 2 for the nitrate removal model was higher than 0.99. With regard to supporting electrolytes, more nitrate reduction is obtained with NaCl. The oxidation reduction potential (ORP) was changed from 220 to -375 mV and this range is suitable for denitrification and nitrate reduction. Conclusions:The results of this study show that it is possible to remove nitrate, and its intermediates from waste water. Regarding the desirability of the process, the field scale study is proposed.

show abstract

Section: Effect Of Oxidation Reduction Potentialmentioning

confidence: 99%

Section: Effect Of Oxidation Reduction Potentialmentioning

confidence: 99%

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Hossini

Rezaee

2014

Health Scope

View full text Add to dashboard Cite

show abstract

“…Nitritation has been obtained in continuous mode [11,12,[30][31][32][33][34] or batch process [32,[35][36][37]. In general, continuous operation is usually the preferred choice when the reactor has to treat large flow-rates.…”

Section: Why Continuous Operation May Be the Preferred Choice?mentioning

confidence: 99%

Efficient and automated start-up of a pilot reactor for nitritation of reject water: From batch granulation to high rate continuous operation

Torà

Moliné

Carrera

et al. 2013

Chemical Engineering Journal

View full text Add to dashboard Cite

“…As these values were only an estimation of the best structure, this should be obtained from a trial and error procedure. Different networks with sizes and structures around those defined by (9) and (10) were trained and their performance measured with the topographic and quantization errors provided by (11) and (12) (Figure 3). The structure providing the best performance was 19 × 10.…”

Section: Representative Parameters Identification With Sommentioning

confidence: 99%

“…They are mainly based on studying the dissolved oxygen profiles [9,10], ORP profiles [11,12], pH profiles [13], or ammonia and nitrogen profiles [14]. Nevertheless, it is important to bear in mind that neither the vessel configuration nor the control strategies carry out the pollutant removing process, rather it is the microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Obtaining Key Parameters and Working Conditions of Wastewater Biological Nutrient Removal by Means of Artificial Intelligence Tools

Vega

Jaramillo-Morán

2018

Water

View full text Add to dashboard Cite

Abstract:The oxidation-reduction potential (ORP) and the dissolved oxygen (DO) have been monitored in a municipal wastewater treatment plant (WWTP). Three thousand two hundred aeration-non-aeration cycles were recorded. They were analyzed by defining 16 parameters to characterize each one of them. The vectors so obtained were treated with the box-plot tool to reject those with outliers (abnormally high or low values). The remaining data were processed by a neural network (self-organizing map: SOM) in order to classify them into classes and to obtain relations between parameters to identify those more representative of the system dynamics. They were: the oxygen uptake rate (OUR), the oxygen rise average slope (ORAS), and the oxidation-reduction potential "arrow" (ORP arrow , the maximum distance between the ORP curve and its linearization). Finally, the classes obtained from SOM were grouped into four macro-classes by means of the K-means algorithm in order to define four operation states related to seasonal and load characteristics, which may be taken into account, along with the key parameters, in the WWTP management with the aim of improving the nutrient removal performance by adapting their controllers to seasonal and load variations.

show abstract

‘Swinging ORP’ as operation strategy for stable reject water treatment by nitritation–anammox in sequencing batch reactors

Cited by 47 publications

References 35 publications

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Optimization of Nitrate Reduction by Electrocoagulation Using Response Surface Methodology

Efficient and automated start-up of a pilot reactor for nitritation of reject water: From batch granulation to high rate continuous operation

Obtaining Key Parameters and Working Conditions of Wastewater Biological Nutrient Removal by Means of Artificial Intelligence Tools

Contact Info

Product

Resources

About